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test_linkify.py
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test_linkify.py
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import re
import pytest
from urllib.parse import quote_plus
from bleach import linkify, DEFAULT_CALLBACKS as DC
from bleach.linkifier import Linker, LinkifyFilter
from bleach.sanitizer import Cleaner
def test_empty():
assert linkify("") == ""
def test_simple_link():
assert (
linkify("a http://example.com link")
== 'a <a href="http://example.com" rel="nofollow">http://example.com</a> link'
)
assert (
linkify("a https://example.com link")
== 'a <a href="https://example.com" rel="nofollow">https://example.com</a> link'
)
assert (
linkify("a example.com link")
== 'a <a href="http://example.com" rel="nofollow">example.com</a> link'
)
def test_trailing_slash():
assert (
linkify("http://examp.com/")
== '<a href="http://examp.com/" rel="nofollow">http://examp.com/</a>'
)
assert (
linkify("http://example.com/foo/")
== '<a href="http://example.com/foo/" rel="nofollow">http://example.com/foo/</a>'
)
assert (
linkify("http://example.com/foo/bar/")
== '<a href="http://example.com/foo/bar/" rel="nofollow">http://example.com/foo/bar/</a>'
)
def test_mangle_link():
"""We can muck with the href attribute of the link."""
def filter_url(attrs, new=False):
if not attrs.get((None, "href"), "").startswith("http://bouncer"):
quoted = quote_plus(attrs[(None, "href")])
attrs[(None, "href")] = f"http://bouncer/?u={quoted}"
return attrs
assert (
linkify("http://example.com", callbacks=DC + [filter_url])
== '<a href="http://bouncer/?u=http%3A%2F%2Fexample.com" rel="nofollow">http://example.com</a>'
)
def test_mangle_text():
"""We can muck with the inner text of a link."""
def ft(attrs, new=False):
attrs["_text"] = "bar"
return attrs
assert (
linkify('http://ex.mp <a href="http://ex.mp/foo">foo</a>', callbacks=[ft])
== '<a href="http://ex.mp">bar</a> <a href="http://ex.mp/foo">bar</a>'
)
@pytest.mark.parametrize(
"data, parse_email, expected",
[
("a james@example.com mailto", False, "a james@example.com mailto"),
("a james@example.com.au mailto", False, "a james@example.com.au mailto"),
(
"a james@example.com mailto",
True,
'a <a href="mailto:james@example.com">james@example.com</a> mailto',
),
(
"aussie james@example.com.au mailto",
True,
'aussie <a href="mailto:james@example.com.au">james@example.com.au</a> mailto',
),
# This is kind of a pathological case. I guess we do our best here.
(
'email to <a href="james@example.com">james@example.com</a>',
True,
'email to <a href="james@example.com" rel="nofollow">james@example.com</a>',
),
(
"<br>jinkyun@example.com",
True,
'<br><a href="mailto:jinkyun@example.com">jinkyun@example.com</a>',
),
# Mailto links at the end of a sentence.
(
"mailto james@example.com.au.",
True,
'mailto <a href="mailto:james@example.com.au">james@example.com.au</a>.',
),
# Incorrect email
('"\\\n"@opa.ru', True, '"\\\n"@opa.ru'),
# RFC6068 special characters
(
"gorby%kremvax@example.com",
True,
'<a href="mailto:gorby%25kremvax@example.com">gorby%kremvax@example.com</a>',
),
(
"unlikely?address@example.com",
True,
'<a href="mailto:unlikely%3Faddress@example.com">unlikely?address@example.com</a>',
),
],
)
def test_email_link(data, parse_email, expected):
assert linkify(data, parse_email=parse_email) == expected
@pytest.mark.parametrize(
"data, expected",
[
(
'"james"@example.com',
"""<a href="mailto:%22james%22@example.com">"james"@example.com</a>""",
),
(
'"j\'ames"@example.com',
"""<a href="mailto:%22j%27ames%22@example.com">"j'ames"@example.com</a>""",
),
(
'"ja>mes"@example.com',
"""<a href="mailto:%22ja%3Emes%22@example.com">"ja>mes"@example.com</a>""",
),
],
)
def test_email_link_escaping(data, expected):
assert linkify(data, parse_email=True) == expected
def no_new_links(attrs, new=False):
if new:
return None
return attrs
def no_old_links(attrs, new=False):
if not new:
return None
return attrs
def noop(attrs, new=False):
return attrs
@pytest.mark.parametrize(
"callback, expected",
[
(
[noop],
'a <a href="http://ex.mp">ex.mp</a> <a href="http://example.com">example</a>',
),
([no_new_links, noop], 'a ex.mp <a href="http://example.com">example</a>'),
([noop, no_new_links], 'a ex.mp <a href="http://example.com">example</a>'),
([no_old_links, noop], 'a <a href="http://ex.mp">ex.mp</a> example'),
([noop, no_old_links], 'a <a href="http://ex.mp">ex.mp</a> example'),
([no_old_links, no_new_links], "a ex.mp example"),
],
)
def test_prevent_links(callback, expected):
"""Returning None from any callback should remove links or prevent them
from being created."""
text = 'a ex.mp <a href="http://example.com">example</a>'
assert linkify(text, callbacks=callback) == expected
def test_set_attrs():
"""We can set random attributes on links."""
def set_attr(attrs, new=False):
attrs[(None, "rev")] = "canonical"
return attrs
assert (
linkify("ex.mp", callbacks=[set_attr])
== '<a href="http://ex.mp" rev="canonical">ex.mp</a>'
)
def test_only_proto_links():
"""Only create links if there's a protocol."""
def only_proto(attrs, new=False):
if new and not attrs["_text"].startswith(("http:", "https:")):
return None
return attrs
in_text = 'a ex.mp http://ex.mp <a href="/foo">bar</a>'
assert (
linkify(in_text, callbacks=[only_proto])
== 'a ex.mp <a href="http://ex.mp">http://ex.mp</a> <a href="/foo">bar</a>'
)
def test_stop_email():
"""Returning None should prevent a link from being created."""
def no_email(attrs, new=False):
if attrs[(None, "href")].startswith("mailto:"):
return None
return attrs
text = "do not link james@example.com"
assert linkify(text, parse_email=True, callbacks=[no_email]) == text
@pytest.mark.parametrize(
"data, expected",
[
# tlds
("example.com", '<a href="http://example.com" rel="nofollow">example.com</a>'),
("example.co", '<a href="http://example.co" rel="nofollow">example.co</a>'),
(
"example.co.uk",
'<a href="http://example.co.uk" rel="nofollow">example.co.uk</a>',
),
("example.edu", '<a href="http://example.edu" rel="nofollow">example.edu</a>'),
("example.xxx", '<a href="http://example.xxx" rel="nofollow">example.xxx</a>'),
("bit.ly/fun", '<a href="http://bit.ly/fun" rel="nofollow">bit.ly/fun</a>'),
# non-tlds
("example.yyy", "example.yyy"),
("brie", "brie"),
],
)
def test_tlds(data, expected):
assert linkify(data) == expected
@pytest.mark.parametrize(
"data, expected",
[
("< unrelated", "< unrelated"),
("<U \x7f=&#;>", '<u \x7f="&#;"></u>'),
],
)
def test_escaping(data, expected):
assert linkify(data) == expected
def test_nofollow_off():
assert (
linkify("example.com", callbacks=[])
== '<a href="http://example.com">example.com</a>'
)
def test_link_in_html():
assert (
linkify("<i>http://yy.com</i>")
== '<i><a href="http://yy.com" rel="nofollow">http://yy.com</a></i>'
)
assert (
linkify("<em><strong>http://xx.com</strong></em>")
== '<em><strong><a href="http://xx.com" rel="nofollow">http://xx.com</a></strong></em>'
)
def test_links_https():
assert (
linkify("https://yy.com")
== '<a href="https://yy.com" rel="nofollow">https://yy.com</a>'
)
def test_add_rel_nofollow():
"""Verify that rel="nofollow" is added to an existing link"""
assert (
linkify('<a href="http://yy.com">http://yy.com</a>')
== '<a href="http://yy.com" rel="nofollow">http://yy.com</a>'
)
def test_url_with_path():
assert linkify("http://example.com/path/to/file") == (
'<a href="http://example.com/path/to/file" rel="nofollow">'
+ "http://example.com/path/to/file</a>"
)
def test_link_ftp():
assert linkify("ftp://ftp.mozilla.org/some/file") == (
'<a href="ftp://ftp.mozilla.org/some/file" rel="nofollow">'
+ "ftp://ftp.mozilla.org/some/file</a>"
)
def test_link_with_qs_with_array():
"""Test that urls pick up [] in querystring"""
assert linkify("http://test.com?array[]=1¶ms_in[]=2") == (
'<a href="http://test.com?array[]=1&params_in[]=2" '
+ 'rel="nofollow">http://test.com?array[]=1&params_in[]=2</a>'
)
def test_link_query():
assert (
linkify("http://xx.com/?test=win")
== '<a href="http://xx.com/?test=win" rel="nofollow">http://xx.com/?test=win</a>'
)
assert (
linkify("xx.com/?test=win")
== '<a href="http://xx.com/?test=win" rel="nofollow">xx.com/?test=win</a>'
)
assert (
linkify("xx.com?test=win")
== '<a href="http://xx.com?test=win" rel="nofollow">xx.com?test=win</a>'
)
def test_link_fragment():
assert (
linkify("http://xx.com/path#frag")
== '<a href="http://xx.com/path#frag" rel="nofollow">http://xx.com/path#frag</a>'
)
def test_link_entities_in_qs():
"""Entities in the querystring get escaped"""
assert (
linkify("http://xx.com/?a=1&b=2")
== '<a href="http://xx.com/?a=1&b=2" rel="nofollow">http://xx.com/?a=1&b=2</a>'
)
def test_link_entities_in_characters_token():
"""Entitites in a Characters token don't get escaped"""
assert linkify("foo bar") == "foo bar"
def test_link_entities_in_a_tag():
"""Entitites between an a start tag and an a end tag don't get escaped"""
assert (
linkify('<a href="/">Some entity’s</a>', callbacks=[])
== '<a href="/">Some entity’s</a>'
)
def test_escaped_html():
"""If I pass in escaped HTML, it should probably come out escaped."""
s = "<em>strong</em>"
assert linkify(s) == s
def test_link_http_complete():
assert linkify("https://user:pass@ftp.mozilla.org/x/y.exe?a=b&c=d&e#f") == (
'<a href="https://user:pass@ftp.mozilla.org/x/y.exe?a=b&c=d&e#f" rel="nofollow">'
+ "https://user:pass@ftp.mozilla.org/x/y.exe?a=b&c=d&e#f</a>"
)
def test_non_url():
"""document.vulnerable should absolutely not be linkified."""
s = "document.vulnerable"
assert linkify(s) == s
def test_javascript_url():
"""javascript: urls should never be linkified."""
s = "javascript:document.vulnerable"
assert linkify(s) == s
def test_unsafe_url():
"""Any unsafe char ({}[]<>, etc.) in the path should end URL scanning."""
assert linkify('All your{"xx.yy.com/grover.png"}base are') == (
'All your{"<a href="http://xx.yy.com/grover.png" rel="nofollow">xx.yy.com/grover.png</a>"}'
+ "base are"
)
def test_skip_tags():
"""Skip linkification in skip tags"""
simple = "http://xx.com <pre>http://xx.com</pre>"
linked = (
'<a href="http://xx.com" rel="nofollow">http://xx.com</a> '
+ "<pre>http://xx.com</pre>"
)
all_linked = (
'<a href="http://xx.com" rel="nofollow">http://xx.com</a> '
+ '<pre><a href="http://xx.com" rel="nofollow">http://xx.com'
+ "</a></pre>"
)
assert linkify(simple, skip_tags={"pre"}) == linked
assert linkify(simple) == all_linked
already_linked = '<pre><a href="http://xx.com">xx</a></pre>'
nofollowed = '<pre><a href="http://xx.com" rel="nofollow">xx</a></pre>'
assert linkify(already_linked) == nofollowed
assert linkify(already_linked, skip_tags={"pre"}) == nofollowed
assert linkify(
"<pre><code>http://example.com</code></pre>http://example.com",
skip_tags={"pre"},
) == (
"<pre><code>http://example.com</code></pre>"
+ '<a href="http://example.com" rel="nofollow">http://example.com</a>'
)
def test_libgl():
"""libgl.so.1 should not be linkified."""
s = "libgl.so.1"
assert linkify(s) == s
@pytest.mark.parametrize(
"url, periods",
[
("example.com", "."),
("example.com", "..."),
("ex.com/foo", "."),
("ex.com/foo", "...."),
],
)
def test_end_of_sentence(url, periods):
"""example.com. should match."""
assert (
linkify(f"{url}{periods}")
== f'<a href="http://{url}" rel="nofollow">{url}</a>{periods}'
)
def test_end_of_clause():
"""example.com/foo, shouldn't include the ,"""
assert (
linkify("ex.com/foo, bar")
== '<a href="http://ex.com/foo" rel="nofollow">ex.com/foo</a>, bar'
)
def test_sarcasm():
"""Jokes should crash.<sarcasm/>"""
assert linkify("Yeah right <sarcasm/>") == "Yeah right <sarcasm/>"
@pytest.mark.parametrize(
"data, expected_parts",
[
(
"(example.com)",
{
"before": "(",
"url": "http://example.com",
"text": "example.com",
"after": ")",
},
),
(
"(example.com/)",
{
"before": "(",
"url": "http://example.com/",
"text": "example.com/",
"after": ")",
},
),
(
"(example.com/foo)",
{
"before": "(",
"url": "http://example.com/foo",
"text": "example.com/foo",
"after": ")",
},
),
(
"(((example.com/))))",
{
"before": "(((",
"url": "http://example.com/",
"text": "example.com/",
"after": "))))",
},
),
(
"example.com/))",
{
"before": "",
"url": "http://example.com/",
"text": "example.com/",
"after": "))",
},
),
(
"(foo http://example.com/)",
{
"before": "(foo ",
"url": "http://example.com/",
"text": "http://example.com/",
"after": ")",
},
),
(
"(foo http://example.com)",
{
"before": "(foo ",
"url": "http://example.com",
"text": "http://example.com",
"after": ")",
},
),
(
"http://en.wikipedia.org/wiki/Test_(assessment)",
{
"before": "",
"url": "http://en.wikipedia.org/wiki/Test_(assessment)",
"text": "http://en.wikipedia.org/wiki/Test_(assessment)",
"after": "",
},
),
(
"(http://en.wikipedia.org/wiki/Test_(assessment))",
{
"before": "(",
"url": "http://en.wikipedia.org/wiki/Test_(assessment)",
"text": "http://en.wikipedia.org/wiki/Test_(assessment)",
"after": ")",
},
),
(
"((http://en.wikipedia.org/wiki/Test_(assessment))",
{
"before": "((",
"url": "http://en.wikipedia.org/wiki/Test_(assessment",
"text": "http://en.wikipedia.org/wiki/Test_(assessment",
"after": "))",
},
),
(
"(http://en.wikipedia.org/wiki/Test_(assessment)))",
{
"before": "(",
"url": "http://en.wikipedia.org/wiki/Test_(assessment))",
"text": "http://en.wikipedia.org/wiki/Test_(assessment))",
"after": ")",
},
),
(
"(http://en.wikipedia.org/wiki/)Test_(assessment",
{
"before": "(",
"url": "http://en.wikipedia.org/wiki/)Test_(assessment",
"text": "http://en.wikipedia.org/wiki/)Test_(assessment",
"after": "",
},
),
(
"hello (http://www.mu.de/blah.html) world",
{
"before": "hello (",
"url": "http://www.mu.de/blah.html",
"text": "http://www.mu.de/blah.html",
"after": ") world",
},
),
(
"hello (http://www.mu.de/blah.html). world",
{
"before": "hello (",
"url": "http://www.mu.de/blah.html",
"text": "http://www.mu.de/blah.html",
"after": "). world",
},
),
],
)
def test_wrapping_parentheses(data, expected_parts):
"""URLs wrapped in parantheses should not include them."""
before = expected_parts["before"]
url = expected_parts["url"]
text = expected_parts["text"]
after = expected_parts["after"]
assert linkify(data) == f'{before}<a href="{url}" rel="nofollow">{text}</a>{after}'
def test_parentheses_with_removing():
expected = "(test.py)"
assert linkify(expected, callbacks=[lambda *a: None]) == expected
@pytest.mark.parametrize(
"data, expected_url, expected_after",
[
# Test valid ports
("http://foo.com:8000", "http://foo.com:8000", ""),
("http://foo.com:8000/", "http://foo.com:8000/", ""),
# Test non ports
("http://bar.com:xkcd", "http://bar.com", ":xkcd"),
("http://foo.com:81/bar", "http://foo.com:81/bar", ""),
("http://foo.com:", "http://foo.com", ":"),
# Test non-ascii ports
("http://foo.com:\u0663\u0669/", "http://foo.com", ":\u0663\u0669/"),
(
"http://foo.com:\U0001d7e0\U0001d7d8/",
"http://foo.com",
":\U0001d7e0\U0001d7d8/",
),
],
)
def test_ports(data, expected_url, expected_after):
"""URLs can contain port numbers."""
assert (
linkify(data)
== f'<a href="{expected_url}" rel="nofollow">{expected_url}</a>{expected_after}'
)
def test_ignore_bad_protocols():
assert linkify("foohttp://bar") == "foohttp://bar"
assert (
linkify("fohttp://exampl.com")
== 'fohttp://<a href="http://exampl.com" rel="nofollow">exampl.com</a>'
)
def test_link_emails_and_urls():
"""parse_email=True shouldn't prevent URLs from getting linkified."""
assert linkify("http://example.com person@example.com", parse_email=True) == (
'<a href="http://example.com" rel="nofollow">'
+ 'http://example.com</a> <a href="mailto:person@example.com">'
+ "person@example.com</a>"
)
def test_links_case_insensitive():
"""Protocols and domain names are case insensitive."""
expect = '<a href="HTTP://EXAMPLE.COM" rel="nofollow">HTTP://EXAMPLE.COM</a>'
assert linkify("HTTP://EXAMPLE.COM") == expect
def test_elements_inside_links():
assert (
linkify('<a href="#">hello<br></a>')
== '<a href="#" rel="nofollow">hello<br></a>'
)
assert (
linkify('<a href="#"><strong>bold</strong> hello<br></a>')
== '<a href="#" rel="nofollow"><strong>bold</strong> hello<br></a>'
)
def test_drop_link_tags():
"""Verify that dropping link tags *just* drops the tag and not the content"""
html = (
'first <a href="http://example.com/1/">second</a> third <a href="http://example.com/2/">'
+ "fourth</a> fifth"
)
assert (
linkify(html, callbacks=[lambda attrs, new: None])
== "first second third fourth fifth"
)
@pytest.mark.parametrize(
"text, expected",
[
("<br>", "<br>"),
(
"<br> http://example.com",
'<br> <a href="http://example.com" rel="nofollow">http://example.com</a>',
),
(
"<br> <br> http://example.com",
'<br> <br> <a href="http://example.com" rel="nofollow">http://example.com</a>',
),
],
)
def test_naughty_unescaping(text, expected):
"""Verify that linkify is not unescaping things it shouldn't be"""
assert linkify(text) == expected
def test_hang():
"""This string would hang linkify. Issue #200"""
assert (
linkify("an@email.com<mailto:an@email.com>", parse_email=True)
== '<a href="mailto:an@email.com">an@email.com</a><mailto:<a href="mailto:an@email.com">an@email.com</a>>' # noqa
)
def test_hyphen_in_mail():
"""Test hyphens `-` in mails. Issue #300."""
assert (
linkify("ex@am-ple.com", parse_email=True)
== '<a href="mailto:ex@am-ple.com">ex@am-ple.com</a>'
)
def test_url_re_arg():
"""Verifies that a specified url_re is used"""
fred_re = re.compile(r"""(fred\.com)""")
linker = Linker(url_re=fred_re)
assert (
linker.linkify("a b c fred.com d e f")
== 'a b c <a href="http://fred.com" rel="nofollow">fred.com</a> d e f'
)
assert (
linker.linkify("a b c http://example.com d e f")
== "a b c http://example.com d e f"
)
def test_email_re_arg():
"""Verifies that a specified email_re is used"""
fred_re = re.compile(r"""(fred@example\.com)""")
linker = Linker(parse_email=True, email_re=fred_re)
assert (
linker.linkify("a b c fred@example.com d e f")
== 'a b c <a href="mailto:fred@example.com">fred@example.com</a> d e f'
)
assert (
linker.linkify("a b c jim@example.com d e f") == "a b c jim@example.com d e f"
)
def test_recognized_tags_arg():
"""Verifies that recognized_tags works"""
# The html parser doesn't recognize "sarcasm" as a tag, so it escapes it
linker = Linker(recognized_tags={"p"})
assert (
linker.linkify("<p>http://example.com/</p><sarcasm>")
== '<p><a href="http://example.com/" rel="nofollow">http://example.com/</a></p><sarcasm>' # noqa
)
# The html parser recognizes "sarcasm" as a tag and fixes it
linker = Linker(recognized_tags={"p", "sarcasm"})
assert (
linker.linkify("<p>http://example.com/</p><sarcasm>")
== '<p><a href="http://example.com/" rel="nofollow">http://example.com/</a></p><sarcasm></sarcasm>' # noqa
)
@pytest.mark.parametrize(
"data",
[
"<span>text & </span>",
"a < b",
"link http://link.com",
"text<em>",
"jim ¤t joe",
# Link with querystring items
'<a href="http://example.com?foo=bar&bar=foo&biz=bash">',
],
)
def test_linkify_idempotent(data):
assert linkify(linkify(data)) == linkify(data)
class TestLinkify:
def test_no_href_links(self):
s = '<a name="anchor">x</a>'
assert linkify(s) == s
def test_rel_already_there(self):
"""Make sure rel attribute is updated not replaced"""
linked = 'Click <a href="http://example.com" rel="tooltip">here</a>.'
link_good = (
'Click <a href="http://example.com" rel="tooltip nofollow">here</a>.'
)
assert linkify(linked) == link_good
assert linkify(link_good) == link_good
def test_only_text_is_linkified(self):
some_text = "text"
some_type = int
no_type = None
assert linkify(some_text) == some_text
with pytest.raises(TypeError):
linkify(some_type)
with pytest.raises(TypeError):
linkify(no_type)
@pytest.mark.parametrize(
"text, expected",
[
("abc", "abc"),
("example.com", '<a href="http://example.com" rel="nofollow">example.com</a>'),
(
"http://example.com?b=1&c=2",
'<a href="http://example.com?b=1&c=2" rel="nofollow">http://example.com?b=1&c=2</a>',
),
(
"http://example.com?b=1&c=2",
'<a href="http://example.com?b=1&c=2" rel="nofollow">http://example.com?b=1&c=2</a>',
),
(
"link: https://example.com/watch#anchor",
'link: <a href="https://example.com/watch#anchor" rel="nofollow">https://example.com/watch#anchor</a>',
),
],
)
def test_linkify_filter(text, expected):
cleaner = Cleaner(filters=[LinkifyFilter])
assert cleaner.clean(text) == expected